Butt welding Elbow is made of steel hot-pressing forming or forging-forming elbow, its connection form is directly will elbow and steel pipe butt welding, butt welding elbow According to its radius of curvature, can be divided into long radius butt welding elbow and short radius butt welding elbow; According to the pressure level, there are about 17 kinds, and the American pipe standard is the same, The most commonly used is STD and XS two kinds, according to the angle of the elbow, there are 45 degree butt welding elbow, 90 degree butt welding elbow and 180 degree butt welding elbow and other different angle of elbow; According to the material: carbon steel, alloy steel and stainless steel.